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Marketable Securities
 12 Months Ended
Dec. 31, 2017
Cash and Cash Equivalents [Abstract]  
Marketable Securities
Marketable Securities
A summary of the Company’s cash, cash equivalents and marketable securities is shown below:
 
Amortized Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
 
(in thousands)
December 31, 2017
 
 
 
 
 
 
 
Cash and cash equivalents:
 
 
 
 
 
 
 
Cash and money market funds
$
1,595,377

 
$
—

 
$
—

 
$
1,595,377

Government-sponsored enterprise securities
12,679

 
—

 
(1
)
 
12,678

Commercial paper
57,371

 
—

 
(14
)
 
57,357

Total cash and cash equivalents
$
1,665,427

 
$
—

 
$
(15
)
 
$
1,665,412

Marketable securities:
 
 
 
 
 
 
 
Corporate equity securities
$
43,213

 
$
31,608

 
$
—

 
$
74,821

Government-sponsored enterprise securities
2,304

 
—

 
(1
)
 
2,303

Corporate debt securities (matures within 1 year)
215,639

 
—

 
(363
)
 
215,276

Corporate debt securities (matures after 1 year through 5 years)
50,697

 
—

 
(106
)
 
50,591

Commercial paper (matures within 1 year)
80,372

 
—

 
(109
)
 
80,263

Total marketable securities
392,225

 
31,608

 
(579
)
 
423,254

Total cash, cash equivalents and marketable securities
$
2,057,652

 
$
31,608

 
$
(594
)
 
$
2,088,666

 
 
 
 
 
 
 
 
December 31, 2016
 
 
 
 
 
 
 
Cash and cash equivalents:
 
 
 
 
 
 
 
Cash and money market funds
$
1,183,945

 
$
—

 
$
—

 
$
1,183,945

Total cash and cash equivalents
$
1,183,945

 
$
—

 
$
—

 
$
1,183,945

Marketable securities:
 
 
 
 
 
 
 
Corporate equity securities
$
43,213

 
$
21,347

 
$
—

 
$
64,560

Government-sponsored enterprise securities (matures within 1 year)
15,506

 
2

 
—

 
15,508

Corporate debt securities (matures within 1 year)
111,225

 
—

 
(85
)
 
111,140

Commercial paper (matures within 1 year)
59,331

 
73

 
—

 
59,404

Total marketable securities
229,275

 
21,422

 
(85
)
 
250,612

Total cash, cash equivalents and marketable securities
$
1,413,220

 
$
21,422

 
$
(85
)
 
$
1,434,557


The Company has a limited number of marketable securities in insignificant loss positions as of December 31, 2017, which the Company does not intend to sell and has concluded it will not be required to sell before recovery of the amortized costs for the investments at maturity. There were no charges recorded for other-than-temporary declines in fair value of marketable securities nor gross realized gains or losses recognized in 2017, 2016 or 2015.